Did the Israelites/Hebrews have their own slaves or servants?

I have been reading in Exodus the Israelites had their own servants or slaves. Exodus also talks about some people almost becoming (?) an Israelite (or Hebrew, not sure if same thing) by performing a circumcision. Exodus 12:44-45, 48-49. Who were these servants? Or strangers as well as the kJv also mentions? Were they peoples of another region? How did they attain servants if they were slaves themselves at this point..after the Phaorah died in Exodus 1 that didn't know Joseph? Exodus 1:8. Didn't know slaves could have slaves? I thought the new Phaorah would've stopped any slavery for the slaves if there was anything before that. Sorry if question is unusual.